Which of the following is true of the six atoms of ethylene?
A) Four atoms lie in the same plane, but two atoms are not in this plane.
B) All six atoms lie in the same plane.
C) The carbon atoms have a tetrahedral geometry so the C-C-H angles are approximately 109°.
D) none of the above
B
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Ionic bonds occur when electrons ____
A)are transferred between atoms B)are shared by atoms C)lose their noble gas properties D)have a positive charge E)become separated from their atoms
What specific population characteristics do demographers study? Why is it important to study these things?
What will be an ideal response?
What are amphibians?
A. invertebrates that live part of their lives in water and part on land B. invertebrates that live on land, near water C. vertebrates with secretory skin glands that makes them slimy D. vertebrates that live part of their lives in water and part on land E. vertebrates that live on land, near water
In geologic time, Earth is currently in the:
a. Mesozoic Era. b. Paleozoic Era. c. Cenozoic Era. d. Tertiary Period. e. Jurassic Period.